You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I and my friends planned to go to The Houston Museum of Natural Science in Houston. So please help me in booking a flight ticket.

ASSISTANT: That's good, can you please provide your travel dates for booking flight ticket?

USER: My travelling dates are 10/15 and 10/17.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: The airport codes are from ATL to IAH.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry no flights found as per your requested dates. May I now your name for documentation purpose?

USER: It's ok, thank you for the information. My name is Christine Harris.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.