You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Jessica Wright. Can you help me to book a flight from IAH to MSP?

ASSISTANT: Sure, I will help you in flight ticket booking. May I know your travel dates please?

USER: Sure, my trip dates are 07/21 and 07/23.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok. no issues. Thank you for your information.

ASSISTANT: Thanks for reaching us.

USER: You are welcome.