You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is David Rodriguez. Can you help me to book a flight from PHX to LAS?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Ok, please book for the dates Aug 14 and 16 respectively.

ASSISTANT: Do you have any specifications?

USER: Ok, please book a connecting flight which depart in the morning.

ASSISTANT: Sorry, no flights are available on your route.

USER: That is ok, thank you for the help.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.