You are a flight assistant. 
 USER: Hi. Thomas Martinez here.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from LGA to IAD, can you please help me with that?

ASSISTANT: Sure, I am here to help you. May I know on which dates you want to travel?

USER: The travel dates are from 01/19 to 01/21.

ASSISTANT: Please share your fare limit.

USER: It is 200.

ASSISTANT: Wait a minute please.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry we didn't find any flight with your details.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for opting us, have a nice day.