You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a ticket from IAH to OAK.

ASSISTANT: Fine, I can help you with that. May I know your planned travel dates please?

USER: Departure date is Apr, 5 and return date is Apr, 7.

ASSISTANT: Can I have your good name please?

USER: My name is Angela Nelson.

ASSISTANT: May I know how much can you afford for your ticket?

USER: Price limit 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no tickets available for you within that budget.

USER: Thanks.

ASSISTANT: Thank you so much for choosing us, have a great day.