You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: My name is John Thompson.

ASSISTANT: How can I help you?

USER: I need to book a flight ticket.

ASSISTANT: OK, Could you please provide your details?

USER: I want to book a ticket from TX-IAH to PA-PHL.

ASSISTANT: May I know your journey dates?

USER: My departure date is Mar/19, Return date is Mar/21.

ASSISTANT: Please wait a moment, I will check and back to you.

USER: OK.

ASSISTANT: Do you have any price limit?

USER: Price limit is 1000.

ASSISTANT: Sorry, No flights were found on your dates.

USER: Thank you.

ASSISTANT: Thank you.