You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: Can you help me to book a connecting flight to John Thomas to attend my client meeting at Philadelphia?

ASSISTANT: Sure, Can I know your travelling dates?

USER: I will depart on 03/21 and I intend to return on 03/23.

ASSISTANT: Do you have any fare limit?

USER: I can pay up to 500.

ASSISTANT: Please share me your comfortable airport codes.

USER: I want to start from Atlanta, GA-ATL to Philadelphia, PA-PHL.

ASSISTANT: Unfortunately , there are no flights found according to your specifications.

USER: Ok, no problem. I'll choose another alternative. Thank you.

ASSISTANT:  Ok, Thank you for reaching us.