You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Thomas Moore here.

ASSISTANT: Moore, what kind of assistance you are looking for?

USER: I want to change my reservation as my grandfather is unwell and I have to stay with him for some days. Can you please help me in changing my reservation?

ASSISTANT: Sure, I am glad to help you. Please give me a moment to check your ticket status in our website.

USER: Thank you so much. I will wait for your response.

ASSISTANT: Sorry Thomas, no reservation is available by your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.