You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I support you today?

USER: I am Rachel Harris.

ASSISTANT: Ok.

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

ASSISTANT: Sure, we are mirthful to help you. Can you please provide your take off and landing airport codes?

USER: My source point is HOU to IAH.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I would like to travel on 02/13 to 02/15.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

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

ASSISTANT: Thank you for reaching us.