In most cases it is possible to make a reservation without a passport but certain airlines/governments require passport information at the time of booking or ticketing. In those cases a valid passport is needed. In cases where a passport is needed ( for international travel), but you have yet to get one, please fill in the names on the passenger information page as they will be written on the passports when making a reservation.
If the name on the passport differs from the name at the time of ticketing, the ticket will either have be cancelled and rebooked, or the airline(s) should be contacted direct.
Please be aware of the time it will take for you to receive your passport by checking with the issuing body for your passport before making a reservation.
Travellers are responsible for obtaining and keeping their own travel documents.