You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me to book a flight from SFO to LAX?

ASSISTANT: Sure, can you please provide me with your dates of journey?

USER: I want to travel on Apr 19 and need to return on Apr 21.

ASSISTANT: May I know your good name please?

USER: I am Samuel Garcia.

ASSISTANT: Are you expecting any other help from my side please?

USER: No.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.