You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Young.

ASSISTANT: How may I assist you?

USER: Can you please help me to reserve a flight ticket from Las Vegas to Seattle?

ASSISTANT: Sure, can you please share your source and destination airport codes?

USER: The source and destination airport codes are LAS and SEA.

ASSISTANT: Can I have your planned journey dates please?

USER: The planned travel dates are Mar 29 and Mar 31.

ASSISTANT: Do you need any class preference?

USER: I don't have any class preference.

ASSISTANT: Robert Young, no flights has been found on your planned travel dates.

USER: It's ok, not a problem with that. Thank you for your help.

ASSISTANT: Thank you for choosing our agency.

USER: You are welcome.