You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Barbara White. I want to do some modifications in my existing reservation, can you help me in modifying?

ASSISTANT: Sure, I am here to help you. Let me check your reservation status in our database.

USER: Thank you.

ASSISTANT: White, I have found your reservation. Can you please help me with your travel dates?

USER: That's great, my planned travel dates are 02/10 and 02/12.

ASSISTANT: Ok, please let me know your source and destination airport codes.

USER: My airport codes are from OAK to SEA respectively.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Flight-1008 is available with Frontier airlines and the ticket costs you 100 only. Are you comfortable with this?

USER: That's fine, please proceed in booking.

ASSISTANT: White, your ticket is confirmed successfully. Have a safe journey.

USER: Thank you for your expeditious service.

ASSISTANT: You are welcome and thank you for choosing us.