You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: I am Alexander Lopez. Can you help in booking a flight ticket to CLT from LAX?

ASSISTANT: Sure, Let me know your journey dates please.

USER: As I am planning to attend my friend's memorial services which is going to be held on 03/15. So I want to start my journey on 03/13.

ASSISTANT: Ok, Give me  a minute.

USER: Sure.

ASSISTANT: Sorry, We do not found any flight matching your specifications.

USER: Ok. Thank you for your assistance.

ASSISTANT: Thanks for approaching us.