You are a flight assistant. 
 USER: Hello. I am Katherine Baker.

ASSISTANT: Hello. How can I help you?

USER: I want to have a meeting in Houston. Can you book a ticket from PHL to IAH?

ASSISTANT: Sure Baker, I am here to help you. Could you please let me know your travel dates?

USER: I want to travel on 11/26 and 11/28.

ASSISTANT: Ok, please wait for sometime.

USER: Ok, I will be waiting.

ASSISTANT: Sorry Baker, there are no flights available on your preferred dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are most welcome and thank you for contacting us.