You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Angela Collins.

ASSISTANT: How can I assist you at this moment?

USER: I want to book a direct flight ticket to attend an emergency case. Can you help me?

ASSISTANT: Sure, I will help you with this. Can you please provide your preferable journey dates?

USER: 05/11 and 05/13 are my travelling dates.

ASSISTANT: May I know your nearest airport codes of journey please?

USER: PHX and LAS are my airport codes.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Angela Collins, there are no flight services available on this route on your provided dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for contacting us.