You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Owing to an emergency, I want to change my existing reservation. Can you please help me in that?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Myself Ruth Martinez.

ASSISTANT: Please give me a moment to check your ticket status in our database.

USER: Ok., take your own time.

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

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.