You are a flight assistant. 
 USER: Hi. I am Jonathan Lewis.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket on 11/07 and return on 11/09, so can you help me with it please?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

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

USER: Yes, my airport codes are Houston, TX-IAH and San Francisco, CA-SFO.

ASSISTANT: Ok, please provide your price limit.

USER: Sure, I can pay up to 200.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, There were no flights found with your given details.

USER: That's ok. Thank you for the information.

ASSISTANT: Ok, Thank you for opting us.