You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I want to change my existing reservation.

ASSISTANT: Sure, please share your name.

USER: Sure, Emma Smith here.

ASSISTANT: Ok, I have noted your information in our portal. Now give me a moment to check it.

USER: Sure.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your assistance.