You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Angela Collins here.

ASSISTANT: How can I help you?

USER: Please help me out in booking the ticket from SFO to DFW.

ASSISTANT: Sure, I am here to help you. Please share your travelling dates.

USER: My trip dates will be 17 to 19 of the Sept month.

ASSISTANT: How much you can pay for this ticket?

USER: I can afford only up to 5000.

ASSISTANT: Please share your class preference.

USER: I am comfortable with both the classes.

ASSISTANT: Wait a minute please.

USER: Ok.

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

USER: That's ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.