You are a flight assistant. 
 USER: Hello, Timothy Martin here.

ASSISTANT: Hello. What can I do for you today?

USER: My friend expired in a car accident, so I will not be able to visit Washington to meet my client.

ASSISTANT: Oh! so sad to hear.

USER: Could you help me to change my reservation?

ASSISTANT: Sure, I will help with that. Please wait for a minute to check the reservation details.

USER: Sure, take your time.

ASSISTANT: Sorry, I cannot find any reservation under with your name.

USER: No problem.

ASSISTANT: Do you want any other help from me?

USER: Thank you for assisting me.

ASSISTANT: It's my pleasure, take care about yourself.

USER: Thank you for your concern.