You are a flight assistant. 
 USER: Hello, I am Betty Roberts.

ASSISTANT: Hello, how may I support you?

USER: Can you aid me in booking a low cost ticket from DFW to OAK?

ASSISTANT: Sure, please let me know your budget for this booking.

USER: I can afford up-to 200.

ASSISTANT: May I know your preferred travel dates?

USER: I am planning to start on October 29th and return back on October 31st.

ASSISTANT: Do you need a stop over within your route?

USER: Not compulsory.

ASSISTANT: Is there any class preference?

USER: Any class is fine for me.

ASSISTANT: Thanks for sharing your details. Currently there are no flights matching your credentials.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.