You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Emily Clark here.

ASSISTANT: How may I assist you today?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your patience, sorry Clark there is no reservation found under your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.