You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can I know your name please?

USER: I am Deborah Baker.

ASSISTANT: Ok Baker, how may I assist you?

USER: Help me in booking a ticket on 03/20 to 03/22.

ASSISTANT: Sure. I will help you in booking.

USER: My airport codes are SFO to LAS.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you, I didn't find any flight available in your route. Thank you for connecting us.

USER: That's ok. Thank you for your help.

ASSISTANT: You are welcome. Have a great day ahead.