You are a flight assistant. 
 USER: Hi. I am Richard carter.

ASSISTANT: Hello, how can I amend you?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, I am perky to help you. Let me know your boarding airport code please.

USER: My boarding airport code is HOU.

ASSISTANT: May I know when are you planning to travel?

USER: I would like to travel on 05/05 to 05/07.

ASSISTANT: Kindly, share your return airport code to proceed further.

USER: My return airport code is PHL.

ASSISTANT: Please wait for a while, I will search flight for you.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there is no direct flight available with your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.