You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Nicole Nelson.

ASSISTANT: Nice to meet you Nelson.

USER: Actually, I booked a ticket to OAK for a music concert but due to bad weather, the concert is postponed. Could you help me in changing the dates of my existing reservation?

ASSISTANT: Sure, I will help you, please give me a moment to check it.

USER: Sure, take your time.

ASSISTANT: Thank you for your waiting. When I search in our data base, there is no previous booking found under the name which you have provided.

USER: Ok.

ASSISTANT: Is there any other help that you need from us?

USER: No, thank you for your time.

ASSISTANT: Thank you for reaching us. Have a nice day.