You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Hill.

ASSISTANT: How can I help you?

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Ok, Can you please share me your travelling dates?

USER: My travelling dates will be on Aug 17 to Aug 19.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: Mu journey starts from HOU to IAD.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Here, I found a flight for you with single connection and ticket fare is 200. Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your ticket is booked with flight number 1007 and airline is Spirit.

USER: Thank you.

ASSISTANT: Welcome, have a safe flight.