You are a flight assistant. 
 USER: Hello. I am Thomas Thompson.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I need to book a ticket to meet my friend on 10/12 with single stopover.

ASSISTANT: Ok.

USER: Could you please help me in booking a return ticket on 10/14?

ASSISTANT: Sure, I am mirthful to help you. Do you have price limit?

USER: I can pay up to 200.

ASSISTANT: Can I know your airport codes of trip?

USER: My airport codes are LAX and IAD.

ASSISTANT: Please wait for a while, I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately, there is no connecting flight available with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.