You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Smith.

ASSISTANT: How can I assist you today?

USER: I am searching to reserve a plane ticket from OAK to SEA.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, my trip dates could be from 03/14 to 03/16.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: There is no flights found under your preferable details. Thank you for reaching us, have a great day.

USER: No problem, I will choose any other alternative way to reach my destination. Thank you.