You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please book a flight ticket from IAH to PHL?

ASSISTANT: Kindly mention your travelling dates?

USER: Thank you. I have planned my travel dates as Sept 05 and Sept 07.

ASSISTANT: Is there any connection limit for you?

USER: Yes, I am looking for direct flight.

ASSISTANT: May I know your name?

USER: Sure, myself George Davis.

ASSISTANT: Ok, please let me know if you need anything else in the mean while I will check.

USER: I do not  have any other specifications.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry George Davis, based on your specifications we haven't found any flights in airline database.

USER: That is fine, no problem. Anyway, thank you for your time.

ASSISTANT: Thanks for contacting us.

USER: Most welcome.