You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm William Carter.

ASSISTANT: How can I help you?

USER: I'm planning to attend Seafood festival at Seattle, can you please help me in ticket booking?

ASSISTANT: William Carter, can you share your travelling dates?

USER: I'm planning to take off on 02/21 and return by 02/23.

ASSISTANT: What will be your airport codes for this journey?

USER: Sure, my source and destination airport codes are PHX and SEA.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: I appreciate your patience.

USER: Thank you.

ASSISTANT: William Carter, no flights are available for you on your required route. Thank you for reaching our agency.

USER: That's ok, I will try to go by some other mode of transportation, thank you anyways.

ASSISTANT: Have a great day.