You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please change my reservation as my plan to go for trekking got postponed. Can you help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Deborah Clark here.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Deborah Clark, there is no reservation found under your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for contacting us.