You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Emma Rodriguez.

ASSISTANT: How can I help you?

USER: I am planning to visit dreamy draw recreation area in Phoenix, PHX. Can you help me to book a flight from Las Vegas, LAS?

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Sept 17 and 19.

ASSISTANT: Do you have any preference?

USER: I want to return in the evening time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.