You are a flight assistant. 
 USER: Hi. Donald Walker here.

ASSISTANT: Hello. I hope you are fine, how can I help you now?

USER: Due to bad weather, my cricket match has been cancelled in San Francisco. So could you help me with change in reservation?

ASSISTANT: Sure, I will help you with that.Please wait for a while. Sorry Donald, there is no reservation found on your name.

USER: Ok. Not a problem.

ASSISTANT: Do you want any help from me?

USER: It is ok I will try out other options.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thanks for your help.

ASSISTANT: You are welcome.