You are a flight assistant. 
 USER: Hi, I am Pamela Walker.

ASSISTANT: Hello, How can I serve you?

USER: I need to book a ticket from Phoenix PHX to Los Angeles LAX. Can you help me in booking a flight ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: Sure, I need to fly on 12/19 and 12/21.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no worries at all. Thank you for your support.

ASSISTANT: Thank you for choosing us.