You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please let me know how may I guide you?

USER: I would like to change my existing reservation, due to sudden demise of my grand father. Can you please help me?

ASSISTANT: Sure, I will help you definitely. Can I know the  name with which you have reserved yous ticket previously?

USER: My name is Brian Baker.

ASSISTANT: Ok Brian Baker, can you please give me a minute?

USER: Sure, take your own time. Sure, take your own time.

ASSISTANT: I am sad to inform you that, I have not found your past reservation in our database to change the details.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome. Thank you for reaching us.