You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I want to change my existing reservation due to tsunami in Japan, can you help me?

ASSISTANT: Sure, I will help you with that. Can I have your name to check reservation status?

USER: My name is Williams Thomas.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Yes, I have found your reservation. Please provide me your travel dates.

USER: I will be travelling on 04/16 to 04/18.

ASSISTANT: Please let me know airport codes too.

USER: My airport codes will be from HOU - DTW for my new journey.

ASSISTANT: Yes, I have found a flight in Hawaiian airlines with connection 1 and price 200, is it ok for you?

USER: Ok, you can book my ticket with this available flight.

ASSISTANT: Ok Thomas, I have confirmed a ticket with flight number 1000.

USER: Thank you for helping me with booking.

ASSISTANT: Most welcome. Thank you for choosing us, have a great journey.

USER: Most welcome.