You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Myself Donald Miller. Can you please help me in booking a flight ticket from IAH to OAK locations?

ASSISTANT: On which dates you are willing to travel?

USER: My travelling dates are from 04/14 and 04/16.

ASSISTANT: Sorry, on this dates no flights are available.

USER: It's ok, I'll complete my trip with some other source. Anyways, thank you for the information.

ASSISTANT: It's my pleasure.